Dial train for roskopf type watches



Feb. 19, 1957 J. BAMAT 2,781,630

DIAL TRAIN FOR ROSKOPF TYPE WATCHES Filed May 5, 1954 7, fda@ UnitedStates APatent O 2,781,630 DIAL TRAIN FOR ROSKOPF TYPE WATCHES JosephBamat, Grenchen, Switzerland, assignor to Amida S. A., Grenchen,Switzerland, a Swiss firm Application May 3, 1954, Serial N o. 427,145Claims priority, application Switzerland February 16, 1954 2 Claims.(Cl. 58--125) My invention has for its object a clockwork for Roskopftype watches. According to my invention, the peripheral teeth on thebarrel control the minute wheel through the agency of two coaxialsuperposed pinions of which one meshes with said barrel teeth and theother wlth the minute wheel, said pinions being interconnected by aspring fitted between them and producing a frictional drive.

I have illustrated in accompanying drawings a preferred embodiment of aclockwork according to my invention, reference being made toaccompanying drawings illustrating said embodiment.

Fig. 1 is a plan View of said clockwork;

Fig. 2 is a cross-section thereof through line Il ll of Fig. 1 on anenlarged scale.

The clockwork illustrated is a Roskopf clockwork wherein the teeth onthe barrel 1 mesh with the center pinion 2 which is arrangedeccentrically and is rigid with the center wheel 3. The finishing gearincludes the third gear 4 5, the fourth or seconds gear 6-7 arrangedcentrally of the clockwork and an escapement gear 8-9. The balance wheelis illustrated diagrammatically at 10.

The teeth on the barrel 1 also control the minute wheel 11-12 throughthe agency of two pinions 13 and 14 arranged in coaxial superposition,the teeth of the barrel 1 meshing with the pinion 13 while the pinion 14meshes with the wheel 12 of the minute wheel. The pinion 14 is mountedloose on the tubular carrier 13a of the pinion 13 and the connectionbetween the two pinions 13 and 14 is provided frictionally by an elasticwasher 15 fitted between the two pinions. The cannon pinion meshing withthe wheel 12, is shown at 16 while 2,781,630 Patented Feb. 19, 1957 ICCthe hour wheel 17, meshes with the pinion 11 of the minute wheel. Itshould be remarked that the pinions 13 and 14 are fitted between theplate 18 and the dial 20, while the cannon pinion 16 operativelyconnected with said pinions and located in adjacent relationship withthe barrel 1 as fully apparent from inspection of Fig. 1 is mountedcoaxially round the spindle 22 carrying the seconds gear 6 7.

What I claim is:

1. In a clockwork for Roskopf type watches including a plate and a dial,the combination of a barrel provided with a single series of peripheralteeth located between the cover and the bottom of said barrel, a minutewheel, a gear including two coaxial pinions, one of which is inpermanent mesh with said barrel teeth and the other' controls the minutewheel, an elastic member interconnesting the two coaxial pinions toproduce a friction drive between the latter said two coaxial pinions andsaid minute wheel being fitted between the plate and the dial, a hollowcannon pinion located in close proximity with the barrel, said hollowcannon pinion being operatively connected with said minute wheel, aseconds wheel extending coaxially and revolubly inside the cannon wheel,gears operatively interconnecting the seconds wheel with the teeth onthe barrel and an escape wheel controlled by the seconds wheel.

2. In a clockwork for Roskopf type watches, the combination of a barrelprovided with a single series of peripheral teeth located between thecover and the bottom of said barrel, a minute wheel located to the sideof the barrel, a gear extending laterally of the barrel, including twocoaxial pinions, one of which is in permanent mesh with said barrelteeth and the other controls the minute wheel, an elastic memberinterconnecting the two coaxial pinions to produce a friction drivebetween the latter, a hollow cannon pinion located in close proximitywith the barrel, the minute wheel being operatively connected with saidcannon pinion, a seconds wheel extending coaxially and revolubly insidethe cannon pinion, gears operatively interconnecting the seconds wheelwith the teeth on the barrel and an escape wheel controlled by theseconds wheel.

References Cited in the le of this patent FOREIGN PATENTS 47,000Switzerland May 13, 1909

